mirror of https://github.com/docker/cli.git
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Copyright The OpenTelemetry Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package propagation // import "go.opentelemetry.io/otel/propagation"
|
|
|
|
import (
|
|
"context"
|
|
|
|
"go.opentelemetry.io/otel/baggage"
|
|
)
|
|
|
|
const baggageHeader = "baggage"
|
|
|
|
// Baggage is a propagator that supports the W3C Baggage format.
|
|
//
|
|
// This propagates user-defined baggage associated with a trace. The complete
|
|
// specification is defined at https://www.w3.org/TR/baggage/.
|
|
type Baggage struct{}
|
|
|
|
var _ TextMapPropagator = Baggage{}
|
|
|
|
// Inject sets baggage key-values from ctx into the carrier.
|
|
func (b Baggage) Inject(ctx context.Context, carrier TextMapCarrier) {
|
|
bStr := baggage.FromContext(ctx).String()
|
|
if bStr != "" {
|
|
carrier.Set(baggageHeader, bStr)
|
|
}
|
|
}
|
|
|
|
// Extract returns a copy of parent with the baggage from the carrier added.
|
|
func (b Baggage) Extract(parent context.Context, carrier TextMapCarrier) context.Context {
|
|
bStr := carrier.Get(baggageHeader)
|
|
if bStr == "" {
|
|
return parent
|
|
}
|
|
|
|
bag, err := baggage.Parse(bStr)
|
|
if err != nil {
|
|
return parent
|
|
}
|
|
return baggage.ContextWithBaggage(parent, bag)
|
|
}
|
|
|
|
// Fields returns the keys who's values are set with Inject.
|
|
func (b Baggage) Fields() []string {
|
|
return []string{baggageHeader}
|
|
}
|